Associated Press: In the face of U.S. opposition, the U.N. chief said Wednesday that guidelines on greenhouse gas emissions cuts favored by Europe and developing countries may be "too ambitious" to include in a final statement on climate change. U.N. Secretary-General Ban Ki-moon’s words strengthen the U.S.-led drive to remove the call for rich nations to slash greenhouse gas emissions by 2020 from the text of an international statement on climate change. Drafts of a final statement at …